This is the ultimate racing brake fluid!Castrol SRF Brake Fluid's unique silicon ester technology absorbs less water than conventional glycol ether fluids and prevents the fluid's high temperature performance from deteriorating. SRF's Dry boiling point of 590F/310C and wet boiling point of 510F/270C is vastly superior to the minimum requirement of 155C demanded by the current US DOT 4 specification. Its ability to withstand temperatures in excess of 300C and superior resistance to the effects of absorbed water have established Castrol SRF Brake Fluid as the world's premier fluid for the hydraulic brakes used in all forms of motorsport and racing.